

Replit
Author: Ashutosh
Replit, formerly Repl.it, is a San Francisco based start-up and an online IDE (integrated development environment) supporting 40 programming languages, including Python, Lua, JavaScript, Julia, C++, C++11, C, C#, HTML/CSS/JS, Python with turtle and LOLCODE. Replit allows users to write code and build apps using a browser, without having to install any software on their devices.


Patreon
Author: RisingSunLight
Patreon is the best place for creators to build memberships by providing exclusive access to their work and a deeper connection with their communities.


Google Colab
Author: theusaf
Colab, or "Colaboratory", allows you to write and execute Python in your browser, with zero configuration required, access to GPUs free of charge, and easy sharing


Google's Coding Competitions
Author: Palskie
Google's Coding Competitions (Code Jam, Hash Code, and Kick Start) enthrall, challenge, and test coders around the world. Try your hand at one, or all three.


Discord.js
Author: Deivid
Discord.js is a powerful node.js module that allows you to interact with the Discord API very easily.


LeetCode
Author: 54skyxenon
Level up your coding skills and quickly land a job. This is the best place to expand your knowledge and get prepared for your next interview.